Patent application number | Description | Published |
20100079854 | RARE-EARTH DOPED CORE MULTI-CLAD FIBER, FIBER AMPLIFIER, AND FIBER LASER - A rare-earth doped core multi-clad fiber includes a core that includes a rare-earth element and a plurality of cladding layers that surround the core. An outermost cladding of the plurality of cladding layers is made of a polymer cladding, the plurality of cladding layers have a polygonal inner cladding, and a shape of a boundary between a second cladding from the outside and the outermost cladding does not have two-fold rotational symmetry. As a result, it is possible to provide a rare-earth doped core multi-clad fiber for an optical amplifier and a fiber laser that has low skew and is inexpensive. | 04-01-2010 |
20100118897 | MULTI-CORE FIBER FOR OPTICAL PUMPING DEVICE AND MANUFACTURING METHOD THEREOF, OPTICAL PUMPING DEVICE, FIBER LASER AND FIBER AMPLIFIER - A multi-core fiber for an optical pumping device is provided. The multi-core fiber includes a plurality of optical fibers that are inserted into holes of an alignment member. The optical fibers and the alignment member are integrated by heating. The alignment member includes a material that has a lower softening temperature than a softening temperature of the optical fibers. | 05-13-2010 |
20110026106 | YTTERBIUM-DOPED OPTICAL FIBER, FIBER LASER, AND FIBER AMPLIFIER - An ytterbium-doped optical fiber of the present invention includes: a core which contains ytterbium, aluminum, and phosphorus and does not contain germanium; and a cladding which surrounds this core. The ytterbium concentration in the core in terms of ytterbium oxide is 0.09 to 0.68 mole percent. The molar ratio between the phosphorus concentration in the core in terms of diphosphorus pentoxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 30. The molar ratio between the aluminum concentration in the core in terms of aluminum oxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 32. The molar ratio between the above aluminum concentration in terms of aluminum oxide and the above phosphorus concentration in terms of diphosphorus pentoxide is 1 to 2.5. | 02-03-2011 |
20110142083 | YTTERBIUM-DOPED OPTICAL FIBER, FIBER LASER AND FIBER AMPLIFIER - An ytterbium-doped optical fiber includes: a core which contains at least ytterbium, aluminum, and phosphorus; and a cladding which encircles the core, wherein an aluminum oxide equivalent concentration of the aluminum in the core is 0.2 mol % or more, a diphosphorus pentaoxide equivalent concentration of the phosphorus is higher than the aluminum oxide equivalent concentration, and the core either does not contain germanium or contains less than 1.1 mol % of germanium in a germanium dioxide equivalent concentration. | 06-16-2011 |
20110206341 | YTTERBIUM-DOPED OPTICAL FIBER - Provided is an ytterbium-doped optical fiber including a core containing at least ytterbium, aluminum and phosphorous and a clad surrounding the core, wherein a molar concentration of diphosphorus pentoxide with respect to phosphorus in the core is equal to a molar concentration of aluminum oxide with respect to aluminum in the core, wherein a ratio of a molar concentration of diphosphorus pentoxide with respect to phosphorus in the core to the molar concentration of ytterbium oxide with respect to ytterbium in the core is higher than or equal to 10 and lower than or equal to 30, and wherein a relative refractive index difference between the core and the clad is higher than or equal to 0.05% and lower than or equal to 0.30%. | 08-25-2011 |
20110305251 | MULTI-CLADDING OPTICAL FIBER, OPTICAL FIBER MODULE, FIBER LASER, AND FIBER AMPLIFIER - Provided is a multi-cladding optical fiber which includes: a core with an average refractive index n | 12-15-2011 |
20120014653 | MANUFACTURING METHOD FOR OPTICAL FIBER PREFORM AND OPTICAL FIBER - Provided is a manufacturing method for an optical fiber preform of which the core is doped with a rare earth element. The method includes: depositing glass particles within a silica tube by the modified chemical vapor deposition method, the glass particles mainly consisting of silicon dioxide; adding the rare earth element and aluminum to the glass particles within the silica tube by the solution doping method; heating the silica tube while flowing a phosphorous-containing gas into the silica tube to sinter the glass particles within the silica tube while adding the phosphorous; and heating and collapsing the silica tube to which the rare earth element, the aluminum, and the phosphorous are added. | 01-19-2012 |
20120033923 | HOLEY SINGLE-MODE OPTICAL FIBER AND OPTICAL TRANSMISSION SYSTEM USING SAME - Provided is a holey single-mode optical fiber including a core not having holes, and a clad having holes extending in a longitudinal direction, in which a refraction index of the core is larger than that of a portion of the clad other than the holes, a radius r | 02-09-2012 |
20120042696 | MEASURING METHOD OF LONGITUDINAL DISTRIBUTION OF BENDING LOSS OF OPTICAL FIBER, MEASURING METHOD OF LONGITUDINAL DISTRIBUTION OF ACTUAL BENDING LOSS VALUE OF OPTICAL FIBER, TEST METHOD OF OPTICAL LINE, MANUFACTURING METHOD OF OPTICAL FIBER CABLE, MANUFACTURING METHOD OF OPTICAL FIBER CORD, AND MANUFACTURING METHOD OF OPTICAL FIBER - A measuring method of a longitudinal distribution of bending loss of an optical fiber includes calculating an arithmetical mean value I(x) from two backscattering light intensities of two backscattering light at a position x obtained by bidirectional OTDR measurement of the optical fiber; and obtaining a bending loss value at the position x from a mode field diameter 2W(x) and a relative refractive index difference Δ(x) at the position x calculated from the arithmetical mean value. | 02-23-2012 |
20120044482 | MEASURING METHOD OF HOLE DIAMETER, HOLE POSITION, HOLE SURFACE ROUGHNESS, OR BENDING LOSS OF HOLEY OPTICAL FIBER, MANUFACTURING METHOD OF HOLEY OPTICAL FIBER, AND TEST METHOD OF OPTICAL LINE OF HOLEY OPTICAL FIBER - A measuring method of a hole diameter of a holey optical fiber includes calculating an arithmetical mean value I(x) from two backscattering light intensities at a position x of two backscattering light waveforms of the holey optical fiber, in which the two backscattering light waveforms are obtained by OTDR measurement; and obtaining the hole diameter at the position x, based on a correlation between an arithmetical mean value I(x) and an hole diameter of the holey optical fiber that is obtained in advance. | 02-23-2012 |
20120288247 | OPTICAL FIBER - Each of a first clad region ( | 11-15-2012 |
20130044988 | COUPLED MULTICORE FIBER - A coupled multi-core fiber | 02-21-2013 |
20130044989 | METHOD OF PRODUCING PREFORM FOR COUPLED MULTI-CORE FIBER, METHOD OF PRODUCING COUPLED MULTI-CORE FIBER, AND COUPLED MULTI-CORE FIBER - Provided is a method of producing a preform | 02-21-2013 |
20130209046 | SOLD PHOTONIC BAND GAP FIBER, FIBER MODULE USING SOLD PHOTONIC BAND GAP FIBER, FIBER AMPLIFIER, AND FIBER LASER - A solid photonic band gap fiber includes: a core area located at a central portion of a cross-section with respect to a longitudinal direction of the fiber, the core area being formed of a solid substance having a low refractive index; cladding areas having base portions formed of a solid substance having a low refractive index, the cladding areas surrounding the core area; and a plurality of fine high refractive index scatterers provided in the cladding areas, and disposed in a dispersed manner so as to surround the core area, the number of fine high refractive index scatterers being formed of a solid substance having a high refractive index, wherein in a state that the solid photonic band gap fiber is held at a predetermined bending radius, propagation in a high-order mode is suppressed by using a difference in a bending loss between a fundamental mode and the high-order mode, and only the fundamental mode is substantially propagated, the fundamental mode and the high-order mode being caused by bending. | 08-15-2013 |
20130308913 | MULTICORE FIBER - A multicore fiber has a plurality of cores; and a clad which surrounds an outer peripheral surface of each of the cores, and at least one of the cores is spirally arranged such that the core rotates around a center axis of the clad. By arranging the cores in this way, it is possible to prevent crosstalk between specific cores from escalating even when the multicore fiber is disposed in a bent state. | 11-21-2013 |